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单选题
使用手提式二氧化碳灭火器时，时节头喷口离火焰的距离一般应在（）左右。
A
1m
B
3m
C
4m
D
5m
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单选题The purpose of the flywheel of a diesel engine is to （）.A
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Ⅰ→Ⅱ→Ⅲ→ⅣB
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单选题对冷冻机油的要求是（）A
粘度低、杂质含量少、水分少、抗氧化安定性好B
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清洗采样电磁阀，1.0MPaB
清洗光源，0.5MPaC
清洗光电池，0.2MPaD
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单选题The starting air entering the cylinder begins when the piston（）A
has nearly come to the TDCB
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